9MM 124 +P vs 147 gr standard pressure
I like my Brownings, and my EAA Witness ca. 1993, too much, to use "plus p". However, in answering the question why to using a 'heavier' versus a 'lighter' bullet weight, yes, the trade-off is penetration comes first. When I use 'heavier' production loads, I use Win. 9mm 147 gr. FMJTC. (USA9MM1).
Hollow Points do not always work as designed, and become modified 'fmjs'.